fix(ssr): stop content-card forcing always-on scrollbars; add tmp/ scratch dir

content-card used `overflow-scroll`, which renders scrollbar tracks even
when the content fits — visible as superfluous bars around the admin chart
cards. Switch to `overflow-auto` so scrollbars only appear when content
genuinely overflows (e.g. wide data tables still scroll).

Also add a gitignored ./tmp/ scratch directory (tracked via .gitkeep) and
document in AGENTS.md that temp files belong there.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/clj/auto_ap/ssr/components/card.clj

@@ -14,5 +14,5 @@
   [:section (merge params {:class (hh/add-class " py-3 sm:py-5" (:class params))})
    [:div {:class (:max-w params "max-w-screen-2xl")}
     (into
-     [:div {:class "relative overflow-scroll shadow-md dark:bg-gray-800 sm:rounded-lg border-2 border-gray-200 dark:border-gray-900 bg-white"}]
+     [:div {:class "relative overflow-auto shadow-md dark:bg-gray-800 sm:rounded-lg border-2 border-gray-200 dark:border-gray-900 bg-white"}]
      children)]])